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/** @file
AsmWriteCr4 function
Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
/**
Writes a value to Control Register 4 (CR4).
Writes and returns a new value to CR4. This function is only available on
IA-32 and x64. This writes a 32-bit value on IA-32 and a 64-bit value on x64.
@param Value The value to write to CR4.
@return The value written to CR4.
**/
UINTN
EFIAPI
AsmWriteCr4 (
UINTN Value
)
{
_asm {
mov eax, Value
_emit 0x0f // mov cr4, eax
_emit 0x22
_emit 0xE0
}
}
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